What is taylor swift martin johnson?

As an AI language model, I don't have access to the latest information. However, I can tell you that Martin Johnson is an American singer, songwriter, and record producer. He is the lead singer of the band Boys Like Girls and has also worked as a songwriter and producer for other artists. Taylor Swift is an American singer, songwriter, and actress who has won numerous awards for her work in the music industry. She has collaborated with many artists throughout her career, but there is no confirmed collaboration between Taylor Swift Martin Johnson.